Help w/ DIPA Recipe

I just started trying 1 gallon BIAB batches of higher gravity beers & tried a scaled down DIPA recipe today. However, my OG came out WAY too low as expected by BeerSmith. Here's the recipe:

Total Water Needed: 2.21 gal
Grain absorption: .21 gal
Boil off: 1 gal/hr

2.50 lb Pale Malt (2 Row) US (2.0 SRM) Grain 1 83.6 %
0.30 lb Caramel/Crystal Malt - 40L (40.0 SRM) Grain 2 10.0 %
0.08 lb Cara-Pils/Dextrine (2.0 SRM) Grain 3 2.8 %
0.11 lb Corn Sugar (Dextrose) (0.0 SRM) Sugar 4 3.5 %

0.25 oz Columbus (Tomahawk) [13.90 %] - Boil 60.0 min Hop 5 75.5 IBUs
0.25 oz Centennial [9.80 %] - Boil 5.0 min Hop 6 10.6 IBUs
0.50 oz Simcoe [12.70 %] - Aroma Steep 0.0 min Hop 7 0.0 IBUs
0.37 oz Centennial [9.80 %] - Dry Hop 13.0 Days Hop 9 0.0 IBUs
0.37 oz Columbus (Tomahawk) [13.90 %] - Dry Hop 13.0 Days Hop 10 0.0 IBUs
0.25 oz Simcoe [12.70 %] - Dry Hop 13.0 Days Hop 11 0.0 IBUs
0.37 oz Centennial [9.80 %] - Dry Hop 5.0 Days Hop 12 0.0 IBUs
0.37 oz Columbus (Tomahawk) [13.90 %] - Dry Hop 5.0
0.25 oz Simcoe [12.70 %] - Dry Hop 5.0 Days Hop 14 0.0 IBUs

Now, BeerSmith said the pre-boil gravity should be 1.040, which I hit at 1.041. However, after boiling for 60 mins, I only came out at 1.054 - nowhere near the 1.085 predicted by BeerSmith.

Any ideas what went wrong here? I've looked at other 5 gallon DIPA recipes & did a quick divide by 5 to see if my grain #'s were approximate & they about matched. What am I missing here? Seems odd. I thought the huge swing from the pre-boil gravity of 1.040 to post-boil of 1.085 was odd, but just went with the software.

Ideas here? I want to start brewing some smaller batches of huger gravity stuff. I keg & don't really want 5 gallons of 9% DIPA......

Thanks!

Did you end up with 1 gallon? If not your OG is going to be drastically decreased by the additional wort.

fyi, 5 gallons of 9% DIPA sounds good... really really good!

BradleyBrew said:

Did you end up with 1 gallon? If not your OG is going to be drastically decreased by the additional wort.

Click to expand...

That's my first question too. Cutting the volume in half should (2 gallons to 1 gallon) should double the gravity so if your preboil volume and gravity was correct, the only answer really would be that your final volume is high.

That could possibly be it. There was maybe 1/2 gal left once the fermenter was filled. I think possibly my boil off rate was off. I haven't boiled on a stove in years & estimated 1 gal per hour boil off. I think it was probably closer to 1/2 per hour & that skewed my end results.

@BradleyBrew, I love DIPA but as I keg & only have one tap, I wouldn't want it on all at once. I'd be ruined every day!